setFloorSegmentMB

Segments smaller than this size are merged more aggressively:

• They are candidates for full-flush merges, in order to reduce the number of segments in the index prior to opening a new point-in-time view of the index.

• For background merges, smaller segments are "rounded up" to this size.

In both cases, this helps prevent frequent flushing of tiny segments to create a long tail of small segments in the index. Default is 16MB.